Error to declare signal

[guidupas]

Hello All!

I am trying to declare a signal as the code below shows:
bancodados.h

#ifndef BANCODADOS_H
#define BANCODADOS_H
 
#include <QObject>
 
class bancoDados : public QObject
{
    Q_OBJECT
 
public:
    explicit bancoDados(QObject *parent = 0);
 
signals:
    void conectar();
 
public slots:
 
};

#ifndef BANCODADOS_H
#define BANCODADOS_H

#include <QObject>

class bancoDados : public QObject
{
    Q_OBJECT

public:
    explicit bancoDados(QObject *parent = 0);

signals:
    void conectar();

public slots:

};

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bancodados.cpp

#include "bancodados.h"
 
#include <QSqlDatabase>
 
bancoDados::bancoDados(QObject *parent) :
    QObject(parent)
{
 
}
void bancoDados::conectar()
{
    bool retorno = true;
 
    emit retorno;
}

#include "bancodados.h"

#include <QSqlDatabase>

bancoDados::bancoDados(QObject *parent) :
    QObject(parent)
{

}
void bancoDados::conectar()
{
    bool retorno = true;

    emit retorno;
}

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Well, when I run this code it show the error:

:-1: error: 1 duplicate symbol for architecture x86_64

:-1: error: 1 duplicate symbol for architecture x86_64

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But, if I change "void conectar();" from signals to public, it runs, but I need to it stays as a signal

Can anyone help me?

Thanks a lot.